Opek HVU-200
From Free Knowledge Base- The DUCK Project: information for everyone
Opek mobile antenna 4-band HF / VHF / UHF.
- FREQUENCY RANGE: 28-29MHz/ 50MHz/ 144MHz/ 430 ~ 440MHz
- GAIN: 1.8 dBi(144MHz) / 4.5 dBi (430 ~ 440MHz)
- POLARIZATION: Vertical
- IMPEDANCE: 50 Ohm
- POWER CAPACITY: 200 Watts (144 / 430 ~440 MHz SSB), 120 Watts (28-29 / 50 MHz SSB)
- CONNECTOR: PL-259
Each section is adjustable to tune in the associated band. Adjustments are made by loosening an Allen screw and moving a section up or down guided by your SWR meter.
SWR Tuning
Experimenting
The first isolator which looks like a black plastic load separating the bottom 70cm portion from the middle 2m portion can be removed leaving only the bottom 70cm portion allowing the antenna to function as a 70cm UHF only antenna. Doing this shortens the wave ratio to match it up perfectly with GMRS frequencies.
